[Oblouk]

I see no problem with the Wording of this study. Firstly the study is not trying to go so far as to determine the reasons for such results. That is it is not statinng the reason behind why ltrs have lower testosterone.

Instead it is seeking to determine "[...] whether being in such a relationship (rather than being married) is the meaningful predictor of male testosterone levels."

Emphasis on meaningful predictor.